Q4. Solve the equation z² = 2.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Q4. Solve the equation z2 = z.
Q5. For which z EC is z² € R?
[Do not just give the answer, but explain why! A formal proof would be perfect.]
Q6. Let f: C→C and g: C→C be functions defined as f(z) = -z and g(z) = zi.
(a) Show that f=gog.
(b) Give a geometric description of the effect of f on the complex plane.
[Hint: it may help to compute the images of a few points.]
(c) Give a geometric description of the effect of g on the complex plane.
[Hint: it may help to compute the images of a few points.]
(d) Explain why (b) and (c) provide an alternate proof of (a).
Transcribed Image Text:Q4. Solve the equation z2 = z. Q5. For which z EC is z² € R? [Do not just give the answer, but explain why! A formal proof would be perfect.] Q6. Let f: C→C and g: C→C be functions defined as f(z) = -z and g(z) = zi. (a) Show that f=gog. (b) Give a geometric description of the effect of f on the complex plane. [Hint: it may help to compute the images of a few points.] (c) Give a geometric description of the effect of g on the complex plane. [Hint: it may help to compute the images of a few points.] (d) Explain why (b) and (c) provide an alternate proof of (a).
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